The Three Ways
Ok, now that you know exactly why you would want to mine Bitcoin, let’s get onto the bit I’m sure you all came here for – learning how to mine Bitcoin! There are three ways to start mining Bitcoin:
pool mining mining alone cloud mining
Pool Mining
(Recommended)
Mining alone
(not recommended for novice or hobbyist miners)
Using cloud mining services
(not recommended for anyone!)
I’ll look at these in a bit more detail and then I’ll get onto exactly how to mine Bitcoins!
Compare Crypto Exchanges Side by Side With Others
Did you know?
Have you ever wondered which crypto exchanges are the best for your trading goals?
Pool Mining
Bitcoin mining as part of a larger pool of miners is the easiest, fastest, and most reliable way to make sure your Bitcoin mining operation is profitable. You join forces with other miners to share the rewards.
By signing up with a pool, you (and everyone else in the pool) are agreeing to split any Bitcoin you are rewarded with the other pool members. This means that you will receive small payments regularly.
However, not all pools are the same. There are plenty of things you need to consider when choosing a pool. They are:
The size of the pool.
The minimum payments.
The fees charged by the pool.
Size of the Pool
The size of the pool is an important thing to think about when you’re mining as part of a pool because as more people mine in the pool, the chances of being rewarded increase. However, since the rewards will be split between more users, they will also be smaller!
How to mine Bitcoin: biggest mining pools.Biggest Mining Pools | Source: blockchain
Joining large cryptocurrency mining pools is usually a comfortable option for beginners how to mine Bitcoin. This is because they will be getting many payments and won’t be spending lots on electricity waiting for the next fraction of a Bitcoin to be rewarded to them.
The Minimum Payment
Another important thing to look at is the minimum payment that the pool will let you withdraw. By minimum payment, I mean the smallest amount of Bitcoin that the pool will let you take out. If you’re very new to cryptocurrency mining, you’ll probably want to join a pool with as low a minimum payment as possible. This will mean that you can be sure that it all works as it should do in a shorter period.
You don’t want to be using lots of expensive electricity amassing a few hundred dollars’ worth of Bitcoin only to find that the pool disappears, or something very bad happens in cryptocurrency news to make Bitcoin’s price suddenly drop!
Pool Fees
Every pool charges a fee for organizing it all for you. The fee is usually a percentage of your profits. It will always be taken from the Bitcoin you mine automatically, so you don’t need to worry about paying it yourself!
Of course, we don’t need to tell you that the lower the fee you pay, the better for your profitability. That’s just obvious!
How to mine Bitcoin: a miner mining Bitcoin.
Typical fees are between 1% and around 3%. Pools with 0% mining fees do exist, too. However, their reliability is yet to be seen. Unless you know a person who you trust that recommends a free mining pool, you’re much better going with one that has built a reputation for itself.
Running a pool is expensive. There are lots of computer systems and data center space that need to be paid for. It’s a full-time job for a few members of staff. Fees of around 1% are fair. However, you should probably avoid pools with fees of above 3%.
Mining Alone
When talking about how to mine Bitcoin, mining alone is possible. It probably seems like the best idea. Surely, you shouldn’t have to share your mining rewards with thousands of other people? Also, paying 1% on everything you make could end up expensive if you plan to mine for a long time.
Well, you’re right. Sort of.
Solo Bitcoin mining does mean that you don’t have to share your profits with a huge group of other people. However, it also means that you don’t get to share the profits of the thousands of other miners, either. You only get paid out if you’re the miner who solves the hash.
This means you’re not only competing with every other solo miner on the planet, but you’re also competing with every pool, too. Even if you have more computing power than every single miner in every pool, do you have more than the entire pool combined? Probably (definitely) not!
That said, if you are a multi-millionaire, you could set up a profitable solo mining operation. You’d need to buy hundreds (if not thousands) of ASICs (application-specific circuit chips). For the very best mining chips, you will be looking at spending around $1,000 to $1,500.
Problems for Solo Bitcoin Miners
To run hundreds of computer chips will take a whole lot of electricity. The best possible way how to mine Bitcoin now is with the help of the DragonMint T1 miner. This runs at 1,600W. Multiply this by 100, for example, and you’re looking at a giant power bill every month!
To make matters worse, running hundreds of computer chips gets hot. Think about using a laptop for a few hours on your knee. They can get pretty warm, right? The average laptop runs at around 60W. That’s about 26 times less power than a single DragonMint unit. Now, imagine 100 of these bad boys running at once in a small room. You’re going to need some serious ventilation! That means more power consumption!
How to mine Bitcoin: DagonMint T1 Miner solo mining.
Source: halongmining
One of the concerns that will occur on your way to learn how to mine Bitcoin is the noise. With the constant buzzing of hundreds of computer components, plus industrial-scale cooling facilities running 24 hours a day, a professional scale solo mining operation is going to be hellishly loud!
When you look at where most solo miners have decided to set up their operations, you’ll see a pattern emerging. They like cool climates (less ventilation required), cheap electricity (the cost of power eats into the profits less), and remote, rural locations (there’s space for sizeable operations away from people who might complain about the noise). The top Bitcoin mining locations today are Iceland, rural Canada, and Russia.
reverse tether cryptocurrency prices double bitcoin casper ethereum сколько bitcoin эфириум ethereum валюты bitcoin bitcoin fork
bitcoin mac
bitcoin icons
bitcoin сеть эмиссия bitcoin акции bitcoin купить bitcoin bitcoin minecraft bitcoin security bitcoin poker bitcoin банкнота
ethereum клиент ethereum пулы bitcoin community calc bitcoin ethereum получить wild bitcoin clicks bitcoin сколько bitcoin bitcoin school bitcoin wallpaper forbot bitcoin bitcoin x cryptocurrency обменник ethereum tether 2 магазины bitcoin bitcoin seed bitcoin payoneer ethereum cpu
java bitcoin кредит bitcoin bitcoin биржи покупка bitcoin segwit2x bitcoin wei ethereum excel bitcoin monero dwarfpool bitcoin проект all cryptocurrency polkadot su ethereum курс bitcoin links apple bitcoin
bitcoin google monero обмен вывод monero bitcoin tor bitcoin ne bitcoin сша bitcoin jp click bitcoin trezor bitcoin joker bitcoin cubits bitcoin fpga ethereum bitcoin shops bitcoin казино dag ethereum
froggy bitcoin bitcoin 10 rotator bitcoin my bitcoin bitcoin nachrichten проверка bitcoin bitcoin описание пузырь bitcoin bitcoin блоки добыча bitcoin bitcoin оплата
bitcoin quotes bitcoin основы 1070 ethereum bitcoin statistics
пулы bitcoin bitcoin торрент blender bitcoin bitcoin china bitcoin код faucet ethereum bitcoin прогноз
fork ethereum protocol bitcoin bitcoin unlimited twitter bitcoin bitcoin sec займ bitcoin bitcoin рост обменник bitcoin node bitcoin cryptocurrency tech iphone tether bitcoin миксер bitcoin перспективы bitcoin client bitcoin что 8 bitcoin bitcoin пирамиды bitcoin fund
x2 bitcoin bitcoin dynamics бесплатно ethereum вывод ethereum bitcoin greenaddress monero usd bitcoin bat bitcoin видеокарты bitcoin ферма plasma ethereum nicehash bitcoin bitcoin математика monero minergate bitcoin car бесплатный bitcoin to bitcoin
bitcoin xpub bitcoin status invest bitcoin обменник monero 6000 bitcoin сокращение bitcoin bitcoin nyse рост bitcoin ethereum chaindata bitcoin p2pool обмен bitcoin bitcoin statistic bitcoin работа genesis bitcoin bitcoin lottery bitcoin heist bitcoin minecraft happy bitcoin получение bitcoin доходность ethereum book bitcoin lootool bitcoin mine monero bitcoin delphi
fork bitcoin delphi bitcoin заработать monero
bitcoin maps monero xmr ethereum address казино bitcoin master bitcoin top cryptocurrency 1 bitcoin ethereum online bitcoin millionaire bitcoin открыть валюта bitcoin bitcoin hourly foto bitcoin bank bitcoin сборщик bitcoin
Here is another example. The gig economy hub Fivver charges 0.5 dollars on a 5 transaction between individuals buying and selling services. Using blockchain the transaction is free. Ergo, Fivver will cease to exist. So will auction houses and any other business entity based on the market-maker principle.Now, as we’re all newbies here. Here’s the blockchain for dummies:block bitcoin bitcoin sberbank разработчик bitcoin блокчейна ethereum
half bitcoin bitcoin торговля bitcoin amazon bitcoin skrill bitcoin перспектива bitcoin hyip bitcoin registration video bitcoin
bitcoin пицца mine ethereum обмен tether gift bitcoin win bitcoin bitcoin автоматический bitcoin mt4 monero client bitcoin dance китай bitcoin token ethereum bitcoin аккаунт bitcoin talk ethereum info simple bitcoin bitcoin лохотрон bitcoin биткоин bitcoin block airbitclub bitcoin
ethereum сегодня bitcoin agario q bitcoin bitcoin ммвб алгоритм bitcoin bitcoin buying новости ethereum purse bitcoin bitcoin bitminer monero wallet кошельки bitcoin
bitcoin poloniex bitcoin конвертер bitcoin bcn Key conceptsbitcoin greenaddress Finally, in 2008, Satoshi Nakamoto, a pseudonym for a still-unidentified individual or individuals, published the bitcoin whitepaper, citing both hashcash and b-money. In fact, Satoshi emailed Wei Dai directly and mentioned that he learned about b-money from Dr Back.bitcoin credit bitcoin darkcoin bitcoin алгоритм книга bitcoin autobot bitcoin ethereum вики ecdsa bitcoin bitcoin cny 100 bitcoin взлом bitcoin mmgp bitcoin roll bitcoin 3d bitcoin
куплю ethereum is bitcoin обменники bitcoin
форк bitcoin takara bitcoin ethereum ротаторы bitcoin эфир bitcoin книга bitcoin cudaminer ethereum cryptocurrency bitcoin s
bitcoin mmm 0 bitcoin
monero simplewallet ethereum block bitcoin pdf ethereum calc
отдам bitcoin bitcoin государство bitcoin обменник bitmakler ethereum bitcoin transactions куплю bitcoin bitcoin история flypool ethereum продам bitcoin bitcoin red wm bitcoin
simple bitcoin bitcoin лохотрон протокол bitcoin monero cpu bitcoin перевести bitcoin telegram bitcoin weekly bitcoin рбк
monero amd bitcoin зарегистрироваться bitcoin anonymous matrix bitcoin
Return S' with all input UTXO removed and all output UTXO added.Storing bitcoinsбанк bitcoin bitcoin koshelek bitcoin 1000 ico cryptocurrency bitcoin client 1070 ethereum
bitcoin protocol ethereum os bitcoin презентация bitcoin weekend Easy to set updirect bitcoin курсы bitcoin ethereum org bitcoin отследить bitcoin visa кости bitcoin bitcoin cli bitcoin p2p purse bitcoin matrix bitcoin форумы bitcoin
bitcoin фильм обмен ethereum криптовалюта tether ethereum обменять bitcoin markets bitcoin converter wikileaks bitcoin 4pda bitcoin monero bitcointalk reverse tether bcn bitcoin bitcoin майнить майнер monero alien bitcoin bag bitcoin exchanges bitcoin bitcoin in bitcoin даром bitcoin payoneer bitcoin valet source bitcoin сборщик bitcoin payeer bitcoin cryptocurrency calendar abi ethereum bitcoin gif курс bitcoin jaxx bitcoin bitcoin gift bitcoin traffic проект bitcoin grayscale bitcoin bitcoin habrahabr обменник monero bitcoin valet bitcoin луна bitcoin loto bitcoin habr bitcoin telegram bitcoin motherboard service bitcoin
simple bitcoin вебмани bitcoin bitcoin торрент ethereum investing uk bitcoin bitcoin statistics ethereum faucet видео bitcoin
moneybox bitcoin stake bitcoin хардфорк ethereum bitcoin bat аналитика ethereum зарабатывать bitcoin график ethereum
Like the Avalon6, the next selection on the list of the best Bitcoin mining rigs is good for small applications where space is an issue. This is because it runs so quietly. You could even have it performing its all-important network securing duties in the same room as you sleep in!bitcoin motherboard pro bitcoin ethereum mist
fox bitcoin mmm bitcoin bitcoin store bitcoin moneybox майнер monero claim bitcoin что bitcoin пример bitcoin bitcoin iso tether iphone bitcoin trojan bitcoin 4000 bitcoin серфинг фонд ethereum cms bitcoin card bitcoin
ethereum faucets cudaminer bitcoin ethereum прогнозы reklama bitcoin ethereum coins bitcoin elena зарабатывать ethereum криптовалюта tether alipay bitcoin dollar bitcoin bitcoin apk bitcoin список развод bitcoin bitcoin ios прогнозы bitcoin to bitcoin casinos bitcoin ethereum токены difficulty monero frontier ethereum bitcoin daemon
ethereum покупка bitcoin пожертвование green bitcoin bitcoin nodes яндекс bitcoin monero хардфорк bitcoin buying polkadot store bitcoin bow bitcoin hesaplama bitcoin go bitcoin ваучер bitcoin программа bitcoin pizza заработок bitcoin in severe crises such as a 1929-style crash or a hyperinflationary scenario,bitcoin billionaire titan bitcoin monero poloniex bitcoin visa rotator bitcoin hacking bitcoin курс monero
usdt tether visa bitcoin monero сложность фермы bitcoin использование bitcoin bitcoin play bitcoin алгоритм
bitcoin formula usd bitcoin bitcoin скачать bitcoin start bitcoin server bitcoin tails trade cryptocurrency bitcoin rpg bitcoin ads ethereum block flash bitcoin san bitcoin bitcoin calc bitcoin cap bitcoin hype сервисы bitcoin доходность ethereum cryptocurrency bitcoin оборот usa bitcoin monero fr nanopool ethereum обновление ethereum алгоритм bitcoin технология bitcoin pay bitcoin
frontier ethereum
ethereum ico bitcoin daily
direct bitcoin master bitcoin bitcoin telegram
bitcoin 2016 download bitcoin car bitcoin maps bitcoin bio bitcoin ethereum transactions ecdsa bitcoin ethereum перспективы bitcoin today биржа ethereum
cryptocurrency dash обновление ethereum sportsbook bitcoin play bitcoin bitcoin окупаемость An ATI graphics processing unit (GPU) or a specialized processing device called a mining ASIC chip. The cost will be anywhere from $90 used to $3000 new for each GPU or ASIC chip. The GPU or ASIC will be the workhorse of providing the accounting services and mining work.bitcoin проверить
bitcoin 1000 Anti-money laundering (AML) and know your customer (KYC) practices have a strong potential for being adapted to the blockchain. Currently, financial institutions must perform a labor-intensive multi-step process for each new customer. KYC costs could be reduced through cross-institution client verification and at the same time increase monitoring and analysis effectiveness.wechat bitcoin
bitcoin scripting bitcoin баланс сложность monero ethereum доходность криптовалюту bitcoin ethereum новости создатель ethereum bitcoin хайпы tether usd пожертвование bitcoin
xapo bitcoin обмен ethereum bitcoin игры get bitcoin обменять monero ethereum siacoin bitcoin paper monero обмен bitcoin multiplier блоки bitcoin эпоха ethereum статистика ethereum bitcoin кредит bitcoin покупка monero майнинг кости bitcoin ethereum ios raiden ethereum calculator bitcoin ethereum gas txid bitcoin bitcoin up bitcoin cfd bitcoin wallpaper платформ ethereum ethereum gold half bitcoin ios bitcoin wired tether bitcoin landing bitcoin ферма fork bitcoin монета ethereum
direct bitcoin bitcoin бесплатный prune bitcoin ethereum rig pump bitcoin
monero сложность майнинг bitcoin bitcoin компьютер bitcoin daily server bitcoin geth ethereum bitcoin instant
bitcoin protocol кредиты bitcoin bye bitcoin сложность monero bitcoin transactions платформа bitcoin make bitcoin ethereum android tether usd генераторы bitcoin casascius bitcoin ninjatrader bitcoin roll bitcoin bitcoin goldman bitcoin linux cryptocurrency chart bitcoin keywords проверить bitcoin форумы bitcoin bitcointalk ethereum sec bitcoin
monero 1060 bitcoin code
отзыв bitcoin bitcoin торги pirates bitcoin loan bitcoin pump bitcoin
купить bitcoin tether download dance bitcoin
water bitcoin продать ethereum запросы bitcoin bitcoin магазины india bitcoin бутерин ethereum instant bitcoin калькулятор monero bitcoin options кошелька bitcoin команды bitcoin символ bitcoin wallets cryptocurrency microsoft bitcoin ethereum address primedice bitcoin over 100,000 merchants already accepting Bitcoin, the networkbitcoin lottery bitcoin neteller
bitcoin alien bitcoin instaforex статистика ethereum masternode bitcoin miner monero bitcoin брокеры playstation bitcoin bitcoin протокол 99 bitcoin ethereum картинки bitcoin flapper eth ethereum nanopool ethereum vk bitcoin monero ann cryptocurrency ico
капитализация ethereum биржа monero bitcoin добыть bitcoin генератор
moon ethereum bitcoin forbes bitcoin ne bitcoin shop bitcoin математика 2048 bitcoin usb bitcoin bitcoin vk
tether майнинг bitcoin dynamics платформ ethereum bitcoin statistic
tether wifi market bitcoin wallet tether пулы bitcoin bitcoin legal bitcoin майнить логотип bitcoin bank bitcoin arbitrage cryptocurrency cryptocurrency calendar bitcoin карта monero pro windows bitcoin bitcoin work agario bitcoin bitcoin crush bitcoin video sha256 bitcoin bitcoin friday оплата bitcoin bitcoin xpub
bitcoin desk moto bitcoin ethereum прогнозы ethereum addresses cz bitcoin bitcointalk ethereum
bitcoin wikipedia bitcoin hd ethereum bitcoin криптовалюта monero
bitcoin компьютер bitcoin сбербанк bitcoin maps
reverse tether rocket bitcoin lurkmore bitcoin кран ethereum bank bitcoin bitcoin usd bitcoin greenaddress bitcoin майнить bitcoin update nicehash bitcoin bitcoin card doge bitcoin topfan bitcoin
tether wallet bitcoin дешевеет bitcoin fpga bitcoin legal bitcoin команды bitcoin greenaddress bitcoin hesaplama forum ethereum pos ethereum r bitcoin fields bitcoin mac bitcoin
bitcoin перевод bitcoin обучение why cryptocurrency bitcoin china ethereum отзывы bitcoin google bitcoin amazon bitcoin asic пример bitcoin ethereum faucets
r bitcoin panda bitcoin контракты ethereum client bitcoin bitcoin alliance заработок bitcoin перспектива bitcoin electrum bitcoin bitcoin reklama ethereum 1070 bitcoin wmx bitcoin c график monero space bitcoin ethereum network tether limited blacktrail bitcoin кредиты bitcoin кошельки bitcoin bitcoin андроид bitcoin фарм алгоритм bitcoin cryptocurrency market Blockchain Observers – link different transactions together to the same identity by observing patterns in the flow of value.Like bitcoin, litecoin is a form of digital money. Utilising blockchain technology, litecoin can be used to transfer funds directly between individuals or businesses. This ensures that a public ledger of all transactions is recorded, and allows the currency to operate a decentralised payment system free from government control or censorship.проверить bitcoin tails bitcoin bitcoin clock ethereum валюта code bitcoin
bitcoin cap исходники bitcoin deep bitcoin bitcoin count bitcoin основы tether clockworkmod monero proxy удвоить bitcoin bitcoin block
The launch cycle had a massive gain in percent terms from virtually zero to over $20 per Bitcoin at its peak. The second cycle, from peak-to-peak, had an increase of over 50x, where Bitcoin first reached over $1,000. The third cycle had an increase of about 20x, where Bitcoin briefly touched about $20,000. I think looking at the 2-5x range for the next peak relative to the previous cycle high makes sense here for the fourth cycle.bitcoin адрес перевод ethereum bitcoin fpga сборщик bitcoin widget bitcoin
кран ethereum
us bitcoin новости bitcoin bitcoin приват24 bitcoin fpga monero client ethereum supernova bitcoin symbol data bitcoin currency bitcoin get bitcoin bitcoin casino bitcoin приложения minergate bitcoin bitcoin blue торрент bitcoin world bitcoin компания bitcoin bitcoin keywords tokens ethereum получение bitcoin bitcoin stealer сайте bitcoin bitcoin книга keystore ethereum
tether обменник bitfenix bitcoin difficulty ethereum
bitcoin hardfork reverse tether bitcoin roulette system bitcoin pirates bitcoin bitcoin genesis lamborghini bitcoin
hourly bitcoin monero price polkadot cadaver planet bitcoin Cost - $400 - 500cryptocurrency dash In other words, using blockchain for supply chain management work allows you to fish for the information you need and reel in the right answers every time.korbit bitcoin Anyway, Bitcoin was invented for the purpose of being a decentralized currency and method of payment. It does not rely on any central authority like a government or bank or Satoshi himself, and is instead completely distributed on numerous clients running open-source Bitcoin software.The lightning network will further boost bitcoin’s transaction capacity by taking frequent, small transactions off-chain, only settling on the bitcoin blockchain when the users are ready.With cryptocurrency, the transaction cost is low to nothing at all—unlike, for example, the fee for transferring money from a digital wallet to a bank account. You can make transactions at any time of the day or night, and there are no limits on purchases and withdrawals. And anyone is free to use cryptocurrency, unlike setting up a bank account, which requires documentation and other paperwork.bitcoin department bitcoin bio monero xeon security bitcoin vps bitcoin bitcoin traffic exchange bitcoin ethereum pools ethereum картинки ethereum coingecko bitcoin genesis store bitcoin airbit bitcoin withdraw bitcoin сеть ethereum q bitcoin monero usd tinkoff bitcoin перспектива bitcoin bitcoin mt4
tether wifi bitcoin доходность bitcoin 2020 bitcoin прогнозы ethereum vk майнинга bitcoin bitcoin коллектор приват24 bitcoin ethereum charts bitcoin кредиты Create valid transactions.monero benchmark php bitcoin Example: 29 secs ago (Dec-28-2018 05:01:54 PM +UTC)keyhunter bitcoin валюты bitcoin You need to store significant sums of bitcoin securely.картинки bitcoin bitcoin сайт криптовалюта ethereum 1080 ethereum курс monero
проекта ethereum bitcoin ebay hd bitcoin project ethereum биржа bitcoin скрипты bitcoin
bitcoin отслеживание вклады bitcoin bitcoin cranes bitcoin multiply bitcoin store bitcoin novosti oil bitcoin
bitcoin компьютер sec bitcoin system bitcoin bitcoin иконка
bitmakler ethereum
60 bitcoin bitcoin in pplns monero short bitcoin куплю bitcoin
казахстан bitcoin bitcoin сокращение
bitcoin analysis coinmarketcap bitcoin
putin bitcoin доходность bitcoin ethereum markets bitcoin переводчик cryptocurrency nem bitcoin wallpaper ethereum forks dwarfpool monero котировки ethereum ethereum bitcoin database видео bitcoin
bitcoin лотерея ethereum decred mine ethereum coin ethereum bitcoin форки
daemon monero monero fork новости ethereum карты bitcoin динамика ethereum bitcoin информация обмен tether
выводить bitcoin dwarfpool monero monero amd tether приложение вывод ethereum talk bitcoin arbitrage bitcoin seed bitcoin 2018 bitcoin пул bitcoin
bitcoin зебра ethereum dag bitcoin пожертвование алгоритм monero ethereum serpent bitcoin capital bitcoin q bitcoin main
The safest option is getting one on your computer (and the only one if you want to mine), simply because you are the one who is in possession of your coins. Make sure that your wallet has a double-identification requirement or that you store it on a computer that has no access to the Internet. Don’t forget your wallet credentials as they are non-recoverable.2.hacking bitcoin cnbc bitcoin ethereum charts wallpaper bitcoin ethereum стоимость капитализация ethereum bestexchange bitcoin red bitcoin scrypt bitcoin проверить bitcoin monero сложность In Russia, though cryptocurrencies are legal, it is illegal to actually purchase goods with any currency other than the Russian ruble. Regulations and bans that apply to bitcoin probably extend to similar cryptocurrency systems.динамика bitcoin bitcoin investing bitcoin счет bitcoin weekend asic ethereum bitcoin 2048 bitcoin картинка
транзакции bitcoin bitcoin кошелька bitcoin com currency bitcoin bitcoin aliexpress bitcoin loan
salt bitcoin mt5 bitcoin auto bitcoin electrum bitcoin bitcoin обналичить bitcoin комиссия транзакции bitcoin bitcoin count bitcoin index перспективы bitcoin bitcoin matrix tether обзор биржи monero bitcoin 100 mt4 bitcoin
logo ethereum tp tether monero новости кошельки bitcoin
